Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham tuc » pham thuc, tham thuc, cham soc
va doan » va doanh, van doan, va dan
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, de cua
vi cua » vai cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang ma hoi. hieu ve ((cham tuc) OR (nham thuc)) va doan ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ma hoi. hieu ve ((cham tuc) OR (nham thuc)) va doan ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ma hoi. hieu ve ((cham tuc) OR (nham thuc)) va doan ((vi cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ma hoi. hieu ve ((cham tuc) OR (nham thuc)) va doan ((vi cua) or (di cua)) tre*.